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Provides a whitelist entry for the Activity URL filter as a parameter
to CastWebContents. No whitelist implies no restrictions.

Bug: internal b/148820675
Test: CQ, verified url request blocking in devtools

Merge-With: eureka-internal/360987

Cq-Depend: chromium:2050038
Change-Id: I9e0c329b31e62e9c6c8e039c0f9de395fd119412
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050039
Commit-Queue: Jiaqi Han <jiaqih@google.com>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743326}